Carburetor



Dec. 3, 1940. c. R. SNYDER 2,223,836

GARBURETOR Filed July 26, 1939 2 Sheets-Sheet 2 Ell Patented Dec. 3,1940 UNITED STATES PATENT OFFICE 13 Claims.

This inventionrelates to improvements in carburetors of the typeemployed for producing -'vaporized or gaseous fuel mixtures for internalcombustion engines.

Certain general objects of the invention reside in the provision of anovel carburetor wherein the carburetted fuel mixture produced therebywill be of an eflicient and uniform character at all speeds of engineoperation, in order to enable an engine to operate with greatersmoothness, flexibility and fuel economy than are obtainable withcarburetors of more conventional design; and in the provision of acarburetor characterized by the simplicity of its mechanicalconstruction and accessibility of its internal mechanisms.

It is another object of the invention to provide a carburetor having arotary impeller, or other equivalent means, by which liquid fueldelivered to the impeller is disseminated in a confined chamber in theform of a fine mist or spray, and through which spray, air is passed inintimate combining and vaporizing contact with the finely dispersedparticles of the impeller discharge spray, so that there is produced aresulting fuel mixture of a more completely vaporized character than isobtainable with ordinary carburetors, and one which may be moreeconomically and efficiently utilized as an explosive mixture in thecylinders of an associated engine.

The present application is a continuation in part of my priorapplication, Serial No. 119,477 filed January 7, 1937 (allowed April 10,1939 and abandoned by failure to pay final fee).

For a further understanding of the invention, reference is to be had tothe following description and the accompanying drawings, wherein:

Fig. 1 is a vertical sectional view taken through a carburetorconstructed in accordance with the,

present invention;

Fig. 2 is a top plan view of my improved carburetor;

Fig. 3 is a detail side elevational view of the air shutter controlmechanism;

Fig. 4 is a detail vertical sectional view on the plane indicated by theline IV-IV ofFig. 1;

Fig. 5 is a similar view on the plane disclosed by the line VV of Fig.1;

Fig. 6 is a horizontal view on the line VI-VI of Fig. 1;

Fig. '7 is a horizontal sectional view taken through the rotary impelleror turbine on the line VIIVII of Fig. 1.

Referring more particularly to-the drawings, the numeral I designatesthe casing of my improved carburetor. In this instance, the casingcomprises circular upper and lower plates 2 and 3, respectively, thesaid plates being spaced by a ring or annulus I, which may be of atransparent or translucent material so that the mechanism arrangedwithin the mixing chamber 5 of the car- 6 buretor may be observed fromthe exterior. Other materials of course may be used in the constructionof the ring or annulus without departing from the invention. 1

Formed with the upper plate 2 is an air ad- 10 mitting conduit 6, thelatter being curved or bent to form an elbow 1 which arises from theplate 2 and terminates in a laterally directed and upwardly projectingextension 8.

In this extension, there is disposed a pair of 15 air-admittingshutters, as indicated at 9 and Ill. Normally, these shutters aredisposed in the horizontal positions indicated in Fig. 1, obstructingair flow into the conduit 6, the adjoining edges of said shutters beingseparated by a thin station- 20 ary divider wall H, which projects ashort distance downwardly into the extension 8.

The shutter 9, substantially rectangular in configuration, is connectedalong one edge with a rock shaft l2, journaled for rotation in the wallsof the extension 8. One end of the shaft l2 pro- Jects exteriorly of theextension 8 and has fixed thereto a crank arm l3, by which the rockshaft is partiallyrotated. The outer end of the crank arm I3 ispivotally connected as at ll with one end of a link l5. The other end ofthis link, as shown in Fig. 3, is slotted as at l6 for the recep tion ofa pin l1 projecting from the outer end of a crank arm l8 which is fixedupon the outer end of a second rock shaft l9, employed in effecting thesupport of the air shutter Ill.

The crank arm I8 is considerably shorter than the crank arm l3 so thatwhen a partial vacuum exists in the chamber 5, the pressure ofatmospheric air on the shutters 9 and III will cause the latter tooscillate about the axes of the rock shafts l2 and [9. The movement ofthe air shutter I0, however, is greater or faster than that of theshutter 9. These shutters operate as individual valves, as the dividerll separates the same and provides two parallel paths of air travel.

These air shutters or valves are linked together by the link l5 and thecrank arms i3 and [8, with the leverage so distributed that the shutter50 ill will travel at a speed much faster than the shutter 93. Further,provision is made in the link age, by use of the slot 16, so that whenthe valve l0 travels its full degrees of movement and comes to rest in afully opened position, the link- 55 age fails to act as a stop inarresting the travel of the second shutter 9, which will have traveledbut a part of its full radius of travel due to the 'air pressure on itand also to .the leverage pull .move toward its open position. Due tothe short length of the crank arm l6, the air pressure required to swingthe shutter l0 into operation or open position is much less than thatrequired on the other shutter, with the result that the shutter II willcomplete its full travel and, as the air presure continues to increase,the second valve will pick up from that point and open until the maximumopening of both shutters is reached. The shutter 9, as will behereinafter explained, is connected to the gasoline flow controllingneedle valve to govern its operation, while the shutter I ll onlyindirectly operates in controlling the needle valve through the linkagejoining the shutters 9 and I6. By the construction disclosed, theshutters are linked together in such manner that one will open at a timeto its fully opened position, the operation of the other being related,pending a greater demand for air inflow into the carburetor.

In Fig. 3, there has been disclosed a pivoted arm 26. This arm is joinedwith a wire 2| or other flexible cable leading to an operators position.By applyinga pulling force to the wire 2!, the foot 22 of the arm 20will engage with the crank arm l3, thus causing the oscillation of therock shaft I 2 and the manual actuation of the fuel control valve of thecarburetor. While a manual choke control has been disclosed, it will beunderstood that the conventional thermostat control may be employed withequal facility.

In order. to coordinate the inflow of liquid fuel into the carburetorwith the inflow of air, the rock shaft I2 is provided with an upstandingear 23, to the upper portion of which is connected one end of a link 24.The other end of this link is connected with an L-shaped lever 25. Thuslever is provided, as shown in Fig. 4, with fulcrum trunnions 26, theends of the trunnions being journaled as at 21 in a ring 28. This ringengages with a flexible diaphragm 29, which closes or seals the openside 30 of a drum-shaped housing 3!. The opposite side of the housing 3|is closed by a removable plate 32, and a fuel pipe line 33 having athreaded fitting 34 enters the housing axially through the plate 32. Thepipe line 33, of course, leads from any suitable source of liquid fuelsupply, but preferably from a source of fluid under pressure as a fuelpump although the device will operate when fed from an elevated tank.The ring 28 is securely united with the diaphragm 25 and-the walls ofthe housing 3| by screws 35, producing a fluid tight connection or seal.

The horizontal arm of the lever 25 extends axially into the interior ofthe. housing 3|, passing through the central portion of the diaphragm 29and to which the lever 25 is securely clamped by the use of a 'nut as.Due tel its flexibility,

the diaphragm 29 permits of limited oscillation of the lever 25 and atthe same time seals the interior of the housing 3| against liquid loss.The provision of the diaphragm 25 thus obviates the necessity foremploying the usual objectionable stufling boxes or packing glands. W

The upper end of the lever 25 is connected with one end of a coil spring31. The other end of the coil spring is Joined with an adiustable bolt38, mounted with the plate 32 of the housing 3|. The spring 31 thusserves in the dual capacity of yieldably maintaining the lever 25 andthe shutters 9 and 10 in their normal positions, and regulating theproportion of fuel and air introduced into the mixing chamber.

The inner end of the lever 25 is slotted as at 40 for the reception of apin 41 carried by the upper end of the stem 42 of a vertically guidedneedle valve 43. The valve and its stem are arranged in ,the verticalpassage 44 provided in a tubular member 45. This member is positionedsnugly within a tubular boss 46 integrally de pending from the elbow Iof the air conduit 6. Toward its lower end, the tubular member isexternally threaded, as at 41, for the reception of a nut 48 which, whentightened, holds a frustoconical air deflecting plate 49 in itsstationary operative position. In this connection, and by reference toFig. 1, it will be noted that the outer peripheral portion of the plate49 is slightly spaced from the lower annular edge of the elbow l,producing a restricted annular space 50 for the flow of air leaving theopen lower end of said elbow.

The extreme lower end of the tubular member 45 is internally threadedfor the reception of a seating guide 5|. This guide extends upwardlyinto the internal passage of the tubular member and is formed at itsupper end with a drilled head 52 for the slidable reception of the stemof the needle valve. The head 52 also acts as an abutment for one end ofa coil spring 53. This spring surrounds the valve stem below the head52, and the lower end of the spring presses against a collar 54 which isfixed on the valve stem immediately above the conical. tapered extremity55 of said needle valve. Thus the tendency of the spring 53 is tomaintain the tapered end 55 of the needle valve in contact with thecorrespondingly tapered and small seating orifice 56, formed axially inthe lower end of the guide 5l. This guide is slotted along its sides andthrough the head 52 so that liquid fuel may readily pass through andaround the same toward the orifice 56.

Also, the lower end of the guide includes an annular flange 51 whichacts as a seat for the inner race 58 of a ball thrust bearing. The outerrace 59 of this hearing is firmly forced into a hub 60 depending fromthe rotary impeller 6|. This impeller, as shown in Figs. 1 and 7,includes radial vanes 62 which communicate at their inner ends with theannular space 50, so that air drawn into the carburetor through theconduit 6 will strike the vanes 'while moving at high velocity, causinghigh speed rotation of the turbine or impeller in order to eflect thecentrifugal dissemination oi the liquid fuel discharged in regulatedquantities through the orifice 56. Connected with a flange 63, forming apart of the hub 60, is a disk-shaped disseminator 64, the latter beingunited with the flange 63 by means of the threaded pins 65.

It will be seen that as air is drawn into the carburetor through'theshutters 9 and I 0, it is caused to travel at high velocity through thespace 50, when it contacts with the vanes 62, producing high speedrotation of the air turbine or impeller 6|. Corresponding high speedrotation is thus imparted to the disseminator 64 as it is directlyconnected with the under part of the impeller or turbine. Thus, liquidfuel, discharged from the orifice 56, is first deposited upon thecentral portion of the disk-shaped disseminator, where it is subject tocentrifugal forces, caused by the rapid notation of the disseminator.Asaresult,thefuelisdischarged 5 from all portions of the outerperipheral edge of the disseminatorintheform ofailnemistof' annularconflguraflon. Air, discharged from the outer portions of the turbine orimpeller, is drawn downwardly through this mist and V intimatelycombines with the liquid fuel particles to produce an efllcient vaporousor gaseous mixturebytheturbulencethussetup. Ittheair space 5| becomestoo small to provide for the air inflow into the carburetor, provisionis made to cause the air to partially lay-pm the turbine or impeller.

Thus, as shown in Figs. 1 and 6, the lower end of the elbow 1, above theimpeller, is formed with arcuate ports 66. These ports are normallyclosed by arcuate shutters II, which are hingedly moimted as at I. Theshutters 61 are kept normally closed by means of springs 88. Theseshutterswillopeninresponsetohighairpressures, permitting a portion ofthe air entering the carburetor to by-pass the impeller or turbine ii.The operation of the shutters i'l, however, is such as not to in any wayinterfere with the desired flow of air through the impeller to cause thehigh speed rotation at any stage of carburetting operation. Thedisseminator disk 4 is somewhat smaller in diameter than the impellerll. These proportions are provided in order that there will be nointerference with the discharge of liquid fuel in spray form from theperipheral edge of the flat surfaceddiskflasaresultofairflow through thecarburetor.

Also, for this reason, a stationary deflector plate ll is arranged belowthe disk 64, so that the flow of air through the carburetor will be inthe paths indicated by the arrows in Fig. 1. The lower plate of the diskSI includes a depending tubular extension II in which is providedtheconventional butterfly valve I2, the latter being carried by atransverse shaft journaled in theextensions II. The lower portion of theextension 1| terminates in a flange by which the carburetor may beattached to an engine intake manifold, not shown. Standard controls,such as a crank arm and rod extending to the accelerator control of thevehicle, may be employed for actuating the butterfly valve I2.

Entering the extension Ii below the butterfly valve I2 is a threadedfitting 13 of a small copper pipe line 14. This pipe line passes, as

shown in Figs. 2 and 4 to a cylinder 15, mounted on the ring 28 of thehousing 3|. "Within the cylinder 15 there is provided a sliding piston16. This piston is connected at one end with a swinging arm 11 which ispivotally mounted as at II on the ring 28. The arm 11 carries anadjustable stop in the form of a screw of the type indicated at 19. Asmall coil spring 80 is connected at one end with the screws 19 and atits other end with the ring 28. A stop pin ll may be used for limitingthe swinging movement of the arm 11 in an outward direction so that thelower end of the screw 19 is removed from engagement with the horizontalportion of the L-shaped lever 25.

By the use of this construction, when the engine associated with thecarburetor is started, a

partial vacuum is set up in the extension I i which is transmittedthrough the pipe line I4 to the cylinder l5, drawing the piston 16inwardly, and

moving the arm ll against the resistance of the spring 80, so that thelower end of the screw 19 will be positioned immediately over thehorizontal branch of the lever 25, thus holding the lever 25 so that theneedle valve will be prevented from completely seating in the orifice56. This provides for the idling of the engine without undue stoppage.However, when the engine is stopped, the vacuum in the cylinder 15 isreleased, so that the piston II and the arm ll will respond to theinfluence of the spring ll, moving the set screw I! to the positiondisclosed in Fig. 4, thus providing for complete setting of the needlevalve in the orifice 5i.

In view of the foregoing, it is seen that the present invention providesa carburetor wherein first of all a very intimate contactis eifectedbetween the liquid fuel and the oxygen of the air, in order to produce ahighly eiilcient carburetted mixture which will burn cleanly andcompletely inthe cylinders of an associated engine to produce smootheven power. The carburetor is particularly sensitive in its response tochanging gaseous condition with virtually no interference orintermingling of one with the other. This transmission of power throughthe diaphragm is also positive with minimum loss or resistance offeredby the seal, due to the diiferentiatlon of pressures of the gaseous orliquid fluids on either side of the seal. This minimum resistance issecured by virtue of the pressure being unable to detrimentally aifectthe linked arms at any point except the fulcrum of the same, where, ofcourse. the pressure is minimized to such an extent as to be scarcelyappreciable.

The construction of the carburetor is such as to maintain automaticallythe desired proportions of the liquid fuel and air in the carburettedmixture at all stages of carburetion. Such proportioning of the fuelmixture is obtained by the operation of the air admitting shutters 9 andIll and the associated linkage employed which is responsive to theoperation of the shutters to govern the degree of opening of the needlevalve and consequently the volume or quantity of liquid fuel deliveredto the disseminating disk. The spring actuated by-pass shutters 61 arealso important in maintaining required volumetric flow of air throughthe mixing chamber of the carburetor, the said by-pass shutterspreventing throttling of the air in the region of the turbine entrance.

A relief valve has been disclosed at 82 in the upper plate 2 of thecasing I in order to relieve the interiorof the carburetor of excessivepressures, such as those which may be produced by engine back-firing.

While I have described the preferred form of the present invention,nevertheless it will be understood that the same is subject toconsiderable modification without departing from the intent and spiritof the invention as set forth in the followingclaims.

I claim:

1. In a. carburetor of the type having a casing formed to include a.mixing chamber provided with air inlet and carburetted fuel outletpassages and fuel disseminating means positioned in the mixing chamber,a fuel conductor tube ex tending into said mixing chamber andterminating adjacent said disseminating means, valve means in said tubefor controlling the flow of connectin said shutter and the outer endofsaid lever to impart movement to the lever to actuate said valve uponmovement of said shutter in response to the passage of air through theair inlet passage.

2. In a'carburetor of the type having a casing formed to include amixing chamber provided with air inlet and carburetted fuel outletpassages and fuel disseminating means positioned in the mixing chamber,a fuel conductor tube extending into said mixing chamber and terminatingadjacent said disseminating means, valve means'in said tube forcontrolling the flow of fuel from said conductor to said means, adrum-shaped fuel receiver communicating with said fuel conductor, saidreceiver having an open side, a flexible diaphragm closing the open sideof said receiver, a valve actuating lever extending through saiddiaphragm and connected at its inner end with said valve means, saidlever being pivotally supported by said receiver adjacent saiddiaphragm, the latter being 35 clamped to said lever and serving toprevent the I escape of fuel therearound, a transversely extendingpartition wall positioned in said air inlet passage to divide it into aplurality of branches, a normally closed shutter mounted 40 for pivotalmovement in each branch and operated by thepassage of air therethrough,connecting means between said shutters to control the degree of relativemovement therebetween, and linkage means extending between one of 45said shutters and the outer end of said valve actuating lever totransmit movement to said valve in response to movement of said shutter.

3. In a carburetor of the typehaving a casing formed to include a mixingchamber provided with air inlet and carburetted fuel outlet passages andfuel disseminating means positioned in the mixing chamber, a fuelconductor tube extending into said mixing chamber and terminatingadjacent said disseminating means, valvemeans in said tube forcontrolling the flow of fuel from said conductor to said disseminatingmeans, a drum-shaped fuel receiver communicating with said fuelconductor, said re-" ceiver having an open side, a flexiblediaphragmclosing the open side of said receiver, a valve actuating leverextending through said diaphragm and connected at its inner end withsaid valve means, said lever being pivotally sup- 65 ported by saidreceiver adjacent said diaphragm,

the latter being clamped to said lever and serving to prevent the-escapeof fuel therearound,

a normally closed pivoted shutter positioned in said air inlet passage,linkage means connecting 70 said shutter and the outer end of said leverto impart movement to the lever to actuate said valve upon movement ofsaid shutter in response to the passage .of air through the air inletpassage, and control means for said lyalve 75 actuating lever includingan arm mounted for swinging movement on said receiver, spring meansnormally tending to hold said arm in an inoperative position, and vacuumoperated meansfor swinging said arm to a position to hold said valve ina partially open position dur-- ing the operation of an engine to whichthe carported within said mixing chamber by said fuel conductor, adeflector wall extending across the inner end of said air inlet conduitin the vicinity of said impeller to maintain a substantially uniformflow of air to said impeller, a spring pressed by-pass valve carried bysaid air inlet conduit in advance of, said deflector and within saidmixing chamber, a disseminating disk secured for rotation with saidimpeller, and valve mechanism for controlling the flow of fuel throughsaid conductor to said disk.

5. In a carburetor of the type having a casing provided with a mixingchamber, air inlet and carburetted fuel outlet conduits, fuel vaporizingmeans supported in the mixing chamber, a fuel conduit extending into themixing chamber and terminating adjacent said vaporizing means, a hollowliquid fuel receiver communicating with said conduit, said receiverhaving a circular opening in one side, valve means extending throughsaid conduit and operating to control the flow of fluid therethrough, anoperating lever for said valve extending into said receiver through theopening, pivot means for said lever extending diametrically across theopening in said fuel receiver, a diaphragm secured over said opening andto said lever in fluidtight relationship, the connection between saiddiaphragm and lever being adjacent said pivot means, the inner end ofsaid-lever being operatively connected with said valve means, springmeans connected with the outer end of said lever and normally tending tomove said' valve to a closed position, a shutter pivotally supported inthe air inlet conduit for movement in response to the passage of airtherethrough, and motion transmitting means between said shutter andsaid lever for moving the latter in opposition to said spring.

6. In a carburetor of the type having a casing provided with a mixingchamber, air inlet and carburetted fuel outlet conduits, fuel vaporizingmeans supported in the mixing chamher and a fuel conduit extending tothe mixing chamber and terminating adjacent said vaporizing means, ahollow liquid fuel receiver communicating with said conduit, saidreceiver having a circular opening in one side, valve means extendingthrough said-conduit and operating to control the flow of fluidtherethrough,

an operating lever for said valve extending into said receiver, throughthe opening, pivot means for said lever extending diametrically acrossthe opening in said fuel receiver, a diaphragm secured over said openingand-to said lever in fluid-tight relationship, the connection betweensaid diaphragm and lever being adjacent said pivot means, the inner endof said lever being posed in the air inlet conduit and dividing it intoa pair of branches, a transversely extending shaft journaled in eachbranch adjacent the wall opposite said partition wall, a shutter securedto each shaft and movable therewith in re sponse to the flow of air intosaid conduit, a crank arm secured to each shaft exteriorly of saidconduit, said crank arms being unequal in length, link means connectingsaid crank arms to provide'for simultaneous movement of the shutters, asecond crank secured to the shaft having the longer crank arm, and alink extending between said second crank and said valve operating leverto impart movement to said valve in proportion to the movement of theshutter provided with the longer crank arm.

7. In a carburetor of the type having a casingwith air inlet andcarburetted fuel outlet passages and fuel vaporizing means positioned inthe mixing chamber, a fuel conductor tube extending into said mixingchamber and terminating adjacent said vaporizing means, valve means insaid tube for controlling the flow of fuel from said conductor to saidvaporizing means, partition means positioned in the air inlet passage todivide it into a plurality of inlet branches, a normally closed pivotedshutter positioned in each branch, and operated by the passage of airtherethrough, means for connecting said shutters to control the degreeof relative opening movement thereof, motion transmitting mechanismconnecting one of said shutters with said valve means to impart movementto the latter when the former moves in response to the passage of airthrough the air inlet pas-' sage, and means for operating said fuelcontrol valve independently of the flow of air through the air inletpassage.

8. In a carburetor, a casing provided with a mixing chamber and inletand outlet passages communicating therewith, a tubular fuel conductingmember projecting through said inlet passage and into said chamber, aplug provided with a reduced bore positioned in the inner end of saidtube, a needle valve movably positioned in said tube and cooperatingwith said plug to control fluid flow through said tube, a leverpivotally supported adjacent the outer end of said tube, an air actuatedmember positioned in said inlet passage, connections between saidmember, said needle valve and the ends of said pivoted lever to actuatesaid valve in response to the movement of air through said inletpassage, an

impeller having a plurality of radiating passages disposed in a plane atright angles to the axis of said chamber rotatably secured to the innerend of said tubular member, the inner ends of the radiating passagescommunicating with the inlet to said chamber, and a disk positionedadjacent the inner end of said tubular member and secured for rotationwith said impeller.

9. A carburetor for internal combustion engines comprising a casinghaving a mixing chamber, an air admitting conduit of smaller diameterthan said chamber entering one side of the latter, a carburetted fueldischarge conduit of smaller diameter than said chamber communicatingwith the opposite side of the latter, a fuel admitting pipe carried bysaid casing and terminating axially within said chamber, valve meansresponsive to the passage of air through said air admitting conduit forcontrolling the passage of fuel through said pipe, a rotatable fueldisseminating disk having a substantially flat surface on which liquidfuel discharged from said pipe is deposited, an air driven rotor ofzontally arranged spaced plates having turbine blades disposed betweenthe same, one of said plates being in open registration with thedischarge end of the air admitting conduit, whereby air drawn throughsaid last-named conduit into said chamber engages the blades of therotor to revolve the latter about the axis of said pipe connection,-therotation of said rotor and disk causing liquid fuel deposited on thedisk to be discharged in finely divided spray form in a substantiallyhorizontal plane from the entire periphery of said disk for intimatecontact with air passing through the mixing chamber in a directiongenerally perpendicular to the fuel spray, and a stationary battle ofgreater diameter than said disk arranged on the opposite side of thelatter as regards said rotor, said baflle and said rotor serving toprovide a protected area about the peripheral portion of saiddisk toprevent air currents passing through said mixing chamber frominterfering with the radial discharge of the liquid fuel from said disk.

10. In a carburetor, a casing having an enlarged mixing chamber, an airinlet conduit communicating with said chamber, 'a pivoted damper valvein said air inlet conduit and responsive to the passage of airtherethrough; a carburetted fuel conductor leading from said mixingchamber, a smooth flat disk mounted for rotary movement in said chamber,means operated by the passage of air through said chamber to rotate saiddisk, a fuel feed line entering said chamber, a nozzle provided at theoutlet of said fuel line, said nozzle being in registration with' thecenter of rotation of said disk, and a valve for controlling the flow offuel through said nozzle, said valve being connected and operated inunison with said damper valve.

11. In a carburetor of the type having a mix ing chamber and air inletand carburetted fuel outlet passages communicating therewith, fuelvaporizing means positioned in said mixing chamber comprising animpeller of the centrifugal type rotatably supported in said chamber,said impeller having spaced disks and curved blades positionedtherebetween, one of said disks having a central opening in registrationwith the air inlet passage of said mixing chamber, means disposed insaid air inlet passage adjacent the impeller for restricting the flow ofair to said impeller, means provided with said air inlet passage inadvance of said air restricting means for causing a portion of the airto enter said mixing chamber without passing through said impeller, afuel vaporising disk supported for rotation with said impeller, andmeans for introducing liquid fuel in regulated quantities to said disk.

12. In a carburetor of the type having a mixing chamber, a fuelconductor having an opening in one side extending into said chamber andreceiving liquid'fuel under superatmospheric pressure, means forcontrolling the flow of fuel from said conductor into said chambercomprising a normally closed valve positioned in said conductor, a leverextending through the opening in the side of said conductor andconnecting with said valve member, flexible means closing the opening inthe side of said conductor, said flexible means having a fluid-tightconnection with said lever and conductor, and means for impartingmotionv to said lever to effect movement of said valve.

13. In a carburetor of the type having a mix-- side of said conductorand connecting with said valve member, flexible means closing theopening in the side of said conductor, said flexible means having afluid-tight connection with said lever and conductor, means forimparting motion to said lever to actuate said valve, and meansresponsive to negative pressures in said carburetted fuel outlet beyondsaid throttle valve to resist movement of said lever to retain saidvalve in a position providing for limited fuel flow into said 6 -mixirchamber.

CHARLES R. SNYDER.

